#include <stdio.h>

int main() {
    printf("今天学习变量的声明\n");
    char _char;
    unsigned char _uChar;
    signed char _sChar;
    int _int;
    unsigned _uInt;
    short _short;
    unsigned short _uShort;
    long _long;
    unsigned long _uLong;
    float _float;
    double _double;
    long double _lDouble;
    return 0;
}
